fix: guard sync GraphQL calls to prevent DeadlockError inside Temporal workflows (OPS-4402)

[palantir-valiot]

Summary

Guard the synchronous blocking API (query, query_one, mutate, execute, and batch paths) so that calling them while an asyncio event loop is running immediately raises a clear RuntimeError directing callers to the async_* methods or a Temporal Activity. This turns a downstream DeadlockError (blocking httpx inside Temporal) into a fast, obvious failure at the call site.

Why

See Linear OPS-4402. The stack trace showed gql.query(...) (pygqlc/GraphQLClient.py:339 via execute:1046) from inside a @workflow.run (valiotworkflows) in valuechainos_queues/.../workflow.py:76. Temporal workflows must never block; the library's primary sync surface had no defense against a running event loop. Triage: NOTIFY+FIX, code_bug, high.

The change is the smallest effective guard: asyncio.get_running_loop() probe (no extra deps) at the entry of every public sync method, before any work or I/O. Follows this repo's AGENTS.md (TDD first, hermetic tests with no sockets/sleeps, uv, ruff format, bandit, version bump + CHANGELOG on every change, lock refresh on every PR, "majestic monolith" / simplest-thing style).

Changes

• pygqlc/GraphQLClient.py: added _assert_not_in_async_context() (raises with prescriptive guidance) and calls from query, query_one, mutate, execute (and transitively batch paths via the same methods).
• tests/pygqlc/gql_client/test_query.py: hermetic regression test (test_sync_query_disallowed_in_async_context) — own client, no 'gql' fixture, no network; asserts raise under asyncio.run() for all four entry points and that the guard is a no-op from plain sync context.
• pygqlc/__version__.py: 3.8.3 (patch for bugfix).
• CHANGELOG.md: top ## [3.8.3] - 2026-06-24 entry in the required style.

Test plan

• TDD: wrote the failing test first; it went red for the exact reason (no RuntimeError raised when calling sync API from within a running loop).
• Made it green; extended coverage to .mutate, .query_one, direct .execute, and the "still works from sync" negative case.
• uv run pytest -k "sync_query_disallowed or helpers or parsers" — 25+ hermetic tests pass (full suite has pre-existing env-dependent failures unrelated to this diff; those tests do not appear in git diff --stat origin/main...HEAD).
• uvx ruff format --check clean.
• uvx bandit -r . -s B101 -ll --exclude $(find . -type d -name '.venv' | paste -sd, -) clean (2 low-confidence items pre-existing, suppressed with # nosec as before).
• uv lock --upgrade run (no net diff in this rebase; lock already current).
• Manual git diff origin/main...HEAD review: exactly the guard + test + version + changelog; no debug prints, no scope creep, no unrelated files.
• Rebased onto advanced origin/main (cb88649), resolved conflicts cleanly, pushed with git push-safe (force-with-lease against the prior remote PR tip).
• PR body written from scratch (no verbatim template).

Closes OPS-4402

[linear-code]

OPS-4402

[palantir-valiot]

Overall Assessment

The change adds an asyncio.get_running_loop() guard to all sync entry points (query/query_one/mutate/execute plus batch paths) so that a clear RuntimeError is raised immediately instead of producing a downstream DeadlockError when pygqlc is misused inside a Temporal workflow (or any running event loop). The implementation, test, version bump, and changelog entry are all sound; no blocking bugs.

Findings

No actionable findings.

Notes

• The guard is deliberately placed before the broad except Exception wrappers in the high-level methods, ensuring the prescriptive RuntimeError is never swallowed (as stated in the PR description).
• Test is hermetic, exercises all four sync paths plus the "still works from plain sync" negative case, and follows the AGENTS.md rules (TDD first, no sockets/sleeps, own client, no shared fixtures).
• Batch entry points (batchQuery/batchMutate) correctly rely on the guard being hit later inside MutationBatch operations rather than duplicating the check. Considered but not flagged because the docstring and behavior match the stated intent.

[palantir-valiot]

The tests job is failing on pre-existing integration tests that are unrelated to this PR's changes.

Exact failing items (quoted from gh run view 27238185761 --log-failed):

FAILED tests/pygqlc/gql_client/test_query_one.py::test_query_one_flatten - AssertionError: Query result must be of type dict
assert <class 'NoneType'> == dict
...
FAILED tests/pygqlc/gql_client/test_subscribe.py::test_subscribe_success - AssertionError: subscribe should return an unsubscribe function
assert <class 'NoneType'> == <class 'function'>
...
FAILED tests/pygqlc/gql_client/test_subscribe.py::test_sub_routing_loop_message - KeyError: '1'
...
FAILED tests/pygqlc/gql_client/test_subscribe.py::test_sub_default_callback - KeyError: '1'
...
Captured stdout: [ERROR] No WSS URL configured for environment test; cannot establish WSS connection

PR file list (gh pr view 71 --json files --jq '.files[].path'):

CHANGELOG.md
pygqlc/GraphQLClient.py
pygqlc/__version__.py
tests/pygqlc/gql_client/test_query.py
uv.lock

None of the failing tests (test_query_one_flatten, the three subscribe tests) or their source files appear in the diff. Our added test (test_sync_query_disallowed_in_async_context) is in test_query.py and passed (visible in the log: tests/pygqlc/gql_client/test_query.py .......).

This is a pre-existing condition on main (the subscription/WSS fixture path is flaky or misconfigured for the "test" environment alias in CI runs even when API/WSS/TOKEN are injected). It should be addressed separately.

(The code change itself, the new hermetic TDD test, formatting, bandit, version, changelog, and lock refresh are all clean; the Palantir reviewer already passed with "No actionable findings".)

[palantir-valiot]

Overall Assessment

This PR adds a defensive guard (_assert_not_in_async_context) to the four public sync entrypoints (query, query_one, mutate, execute) that immediately raises a clear RuntimeError (with guidance to use async_* or a Temporal Activity) when called inside a running event loop. The change prevents the downstream DeadlockError from blocking httpx inside Temporal workflows. Implementation is minimal, follows AGENTS.md (TDD, hermetic tests, version+changelog, ruff/bandit), and has no blocking bugs.

Findings

No actionable findings.

Notes

• The guard is placed at the top of each sync method before any work or I/O, matching the documented intent in _assert_not_in_async_context's docstring.
• Test test_sync_query_disallowed_in_async_context is hermetic (own client, no network, no 'gql' fixture) and covers the positive (raises in loop) and negative (works from plain sync) cases for all four entrypoints.
• Version bumped to 3.8.3 and CHANGELOG entry added per repo rules; the PR description text saying "3.8.2" is only a prose inconsistency, not a code defect.
• Considered whether batchQuery/batchMutate needed explicit guards: they delegate to MutationBatch which ultimately calls the guarded methods, so no additional guard is required.

[palantir-valiot]

⏸️ Awaiting human input

How to push the rebased commit (local 61378bd on main b8a1958) when push-safe exits 3 on CHANGELOG conflict vs stale remote PR tip cff1a7e?

Reason: push-safe rebase recovery conflicted on CHANGELOG.md; do not force; PR#71 is conflicting

Reply on this PR (or the linked Linear thread) to unblock the agent.

[palantir-valiot]

❌ Agent run failed

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in the failed state. The PR remains open for human follow-up.

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